Holding device



Oct. 20, 1942. c. KRALICEK ET AL I 2,299,397

HOLDING DEVICE Original Filed March 18, 1941 INVENTORS fiqwsmucmfi 70 ByW JANDEL.

AT 10mm Patented Oct. 20, 1942 UNI TED STATE are- '1 OFFICE HOLDINGDEVICE Original application March 1 8, 1941, Serial No.

Divided and this application November 14, 1941, Serial No. 419,612

3 Claims.

This application is a division of our pending application, Serial No.383,988, filed March 18,

1941, for Automatic stage drilling machine,

Our invention relates in general to holding devices and moreparticularly to releasable holding devices adapted to hold objects whilebeing worked or drilled.

An object of our invention is the provision of a releasable holdingmeans into which the heads of the bolts or other part of the devicebeing drilled may be readily inserted by the operator and in which whenthe bolt or other object is inserted therein the releasable holdingmeans automatically clamps the bolt or other object for holding samesecurely therein during the drilling operation.

Another object of our invention is the provision of a releasable holdingmeans which when the drilling operations are finished is auto maticallyoperated for ejecting the drilled bolts or other objects therefrom,

Other objects and a fuller understanding of our invention may be had byreferring to the following description and claims, taken in conjunctionwith the accompanying drawing, in which:

Figure 1 is a side elevational view of our releasable holding devicewhich is adapted to hold bolts or other objects during a drillingoperation;

Figure 2 is a plan View of the releasable holding means or device shownin Figure 1;

Figure 3 is a plan view of the bottom part of our releasable holdingmeans with the top pivoted parts removed;

Figure 4 is an end view of the left-hand end of our releasable holdingmeans as shown in Figure 1; and

Figure 5 is a longitudinal cross-sectional view of our releasableholding means or device taken along the lines 5-5 of Figure 2, with thebolt removed.

Our releasable holding means indicated generally by the referencecharacter 2| is particularly adaptable to hold bolts or other objectswhile being drilled, and comprises a lower stationary jaw member 65which may be secured to a work table and an upper pivoted jaw member 66whichis pivoted to opposite sides of the lower stationary jaw member bymeans of pivot members 6? and 68. The lower jaw member 65 is providedwith a replaceable jaw portion 69 to accommodate bolt heads of differentsizes. The replaceable jaw portion 69 may be removably held in positionby means of a screw ill, see Figure 5. The right-hand end of the pivotedjaw member 66 is urged upwardly by a plurality of springs Hdisposedbetween the lower stationary jaw member and the pivoted jawmember. The Springs 1'! by urging the right-hand end of the pivoted jawmember 66 upwardly causes the left hand engaging end to engage the topof the head of a bolt shown in dash-dot lines in Figures 1, 2 and 4 andhold the same firmly against the lower stationary jaw member 55. Thereleasable holding means 2! may be securely held against a rotary worktable, such as shown in our pending application, Serial No. 383,988,filed March 18, 1941, for Automatic stage drilling machine, by means ofa threaded bolt engaging the threaded opening 14 in the lower portion ofthe stationary jaw member 65. At the end of the drilling operation thebolts are released by depressing the extreme right-hand end releaseportion 8| of the pivoted jaw member 66 and the springs 'i'l until thehook latch member 12 swings to the left as shown in Figure 5 under theurge of a spring 13 and engages the top edge of the pivoted jaw member66, which releases the grip upon the bolt head for ejecting same. Thedepressing of the springs H to release the bolt may be by automaticmeans. The bolt is ejected by means of a plunger 15 which is urged tothe left by means of a spring 16. That is to say, just as soon as thepivoted jaw member (i6 is released, the plunger 15 under the urge of thespring 76 ejects the bolts from our releasable holding means. Just assoon as a finished bolt is ejected, the operator stands ready to inserta new bolt into our releasable holding means and upon the insertion ofthe new bolt into our releasable holding means the plunger I5 is pushedto the right as shown in Figure 5 until the righthand end 18 thereofengages an adjustable screw 11 which is carried by the hook latch member12, whereupon the hook latch member 12 is pushed to the right until thehooking engagement is released from the top of the pivoted jaw member 66after which the left-hand end of the pivoted jaw member 66 immediatelyswings downwardly and constrains the head of the bolt against the lowerstationary jaw member 65. The Figure 1 shows the pivoted jaw member inthe unlatch'ed position where the left-hand end of the pivoted jawmember 66 is constraining the head of the bolt against the lowerstationary jaw member 65. The adjustable screw 11 is provided toaccommodate the proper unlatching of the hook latch member 12 from thetop surface of the piv-' oted jaw member 66. As illustrated in Figure 5,

the plunger 1571s arranged to slide back and forth to fit in guidebearings 19 which are spaced apart to give stability to the movement ofthe plunger 15. The guide bearings 19 may be secured to the lowerstationary jaw member 65 by means of nuts 80. The operation of ourreleasable holding means 2| is such that it is completely automatic andfunctions to hold the bolts or other objects therein just as soon as theplunger 15 is pushed to the right in its rearwardmost position andfunctions to release the bolt which is held therein during the drillingoperation just as soon as the extreme right-hand end 8| is depressed.

Although we have described our invention with a certain degree ofparticularity, it is understood that the present disclosure has beenmade only by way of example and that numerous changes in the details ofconstruction and the combination and arrangement of parts may beresorted to without departing from the spirit and the scope of theinvention as hereinafter claimed.

We claim as our invention:

1. A releasable holding means for holding an object comprising, incombination, two pivotally connected jaw members for holding the object,latch means for holding the jaw members apart, trip means engageable bythe object upon the insertion thereof between the jaw members forreleasing the latch means, and spring means for urging the jaw memberstogether for holding the object therebetween 2. A releasable holdingmeans for holding an object comprising, in combination, two pivotallyconnected jaw members for holding the object, latch means for holdingthe jaw members apart, trip means engageable by the object upon theinsertion thereof between the jaw members for releasing the latch means,and spring means for urging the jaw members together for holding theobject therebetween, one of said jaw members having a portion foractuation to oppose the spring means and separate the jaw members,whereupon the iatch means hold the jaw members apart, said trip meansacting to eject the object upon the separation of the jaw members.

3. A releasable holding means for holding an object comprising, incombination, two pivotally connected jaw members for holding the object,latch means for holding the jaw members apart, trip means engageable bythe object upon the insertion thereof between the jaw members forreleasing the latch means, and spring means for urging the jaw memberstogether for holding the object therebetween, one of said jaw membershaving a portion for actuation to oppose the spring means and separatethe jaw members, whereupon the latch means hold the jaw members apart,said trip means acting to eject the object upon the separation of thejaw members, one of said jaw members having a replaceable portion toaccommodate objects of different sizes.

CHARLES KRALICEK. FRANK J. ANDEL.

